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 * Copyright (c) 2024, 2025, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package com.oracle.truffle.espresso.jvmci.meta;

import jdk.vm.ci.meta.JavaConstant;
import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.ResolvedJavaType;
import jdk.vm.ci.meta.UnresolvedJavaType;

public abstract class EspressoResolvedObjectType extends EspressoResolvedJavaType {
    private Class<?> mirrorCache;

    @Override
    public final boolean isPrimitive() {
        return false;
    }

    @Override
    public final JavaKind getJavaKind() {
        return JavaKind.Object;
    }

    @Override
    public boolean isInstance(JavaConstant obj) {
        if (obj.isNull() || !obj.getJavaKind().isObject()) {
            return false;
        }
        return isAssignableFrom(getObjectType(obj));
    }

    protected abstract EspressoResolvedObjectType getObjectType(JavaConstant obj);

    @Override
    public final Class<?> getMirror() {
        if (mirrorCache == null) {
            mirrorCache = getMirror0();
            assert mirrorCache != null : this.getName();
        }
        return mirrorCache;
    }

    protected abstract Class<?> getMirror0();

    @Override
    public abstract ResolvedJavaType lookupType(UnresolvedJavaType unresolvedJavaType, boolean resolve);

    protected abstract AbstractEspressoResolvedInstanceType getJavaLangObject();

    protected abstract AbstractEspressoResolvedInstanceType[] getArrayInterfaces();

    @Override
    public ResolvedJavaType findLeastCommonAncestor(ResolvedJavaType otherType) {
        if (otherType.isPrimitive()) {
            return null;
        } else {
            EspressoResolvedObjectType t1 = this;
            EspressoResolvedObjectType t2 = (EspressoResolvedObjectType) otherType;
            while (true) {
                if (t1.isAssignableFrom(t2)) {
                    return t1;
                }
                if (t2.isAssignableFrom(t1)) {
                    return t2;
                }
                t1 = t1.getSupertype();
                t2 = t2.getSupertype();
            }
        }
    }

    public abstract EspressoResolvedObjectType getSupertype();
}
